Protective cap for engine oil drain valve



FIG. 1 is a top perspective view of a protective cap for an engine oil drain valve;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an elevated right-side view thereof;

FIG. 6 is an elevated left-side view thereof;

FIG. 7 is an elevated front-side view thereof; and,

FIG. 8 is an elevated rear-side view thereof. 

CLAIM The ornamental design for a protective cap for an engine oil drain valve, as shown and described. 